| details |
Late Mississippian |
Permian |
Nd |
Millay,M.A. et al. Paleozoic seed fern pollen organs. |
1979 |
| details |
Nd |
|
Nd |
Remy,W. The systematics of the Pteridosperms including consideration of their pollen. |
1953 |
| details |
Nd |
|
Nd |
Potonie,R. Examples of the natural system of spores, a supplement to the synopsis of the Sporae in situ, 1963 and the research reports from 1965,1967, and 1970 and to the phylogenetic sporolog 1973 |
1975 |
| details |
Nd |
|
Nd |
Stidd,B.M. An Anatomically preserved Potoniea with in situ, spores from the Pennsylvanian of Illinois. |
1978 |
| details |
Nd |
|
Nd |
Pant,D.D. Suggestions for the classification and nomenclature of fossil spores and pollen grains |
1954 |
| details |
Carboniferous |
|
Germany |
Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. |
1995 |
| details |
Late Carboniferous |
|
Europe |
Remy,W. et al. Plant fossils |
1959 |